Wideband multiple channel frequency converter
AssigneeLucent Technologies Inc.
InventorZexiang Zhang
Life of this patent
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Abstract
A wideband multiple channel frequency converter includes a mixer, a frequency generator for generating a local oscillator signal, a power divider for receiving the local oscillator signal and providing a portion of the signal to the mixer and a portion of the signal to a feed forward path which phase and amplitude adjusts the signal and a power combiner for receiving and combining a signal from the mixer and the phase and amplitude adjusted signal from the feed forward path. In addition, an attenuator may be implemented to reduce a power level of a signal to be converted and a band-pass filter may receive the signal from the power combiner. The converter compensates for local oscillator signal leakage and can reduce inter-modulation components.
Claims20
A wideband multiple channel frequency converter comprising:
- a mixer, having a first input for receiving a signal to be converted and a second input for receiving a local oscillator signal;
- a frequency generator for generating a local oscillator signal;
- a power divider for receiving the local oscillator signal, providing a portion of the local oscillator signal to the second input of said mixer and providing a portion of the local oscillator signal to a feed forward path;
- a feed forward path for phase and amplitude adjusting the signal received from said power divider;
- a power combiner for receiving and combining a signal output from said mixer and a phase and amplitude adjusted signal output from said feed forward path.
A wideband multiple channel frequency converter capable of reducing inter-modulation components and local oscillator (LO) leakage components, comprising:
- (a) a variable attenuator for receiving an input signal and reducing a power level of the input signal;
- (b) a mixer for receiving a signal output from said variable attenuator;
- (c) an integrated frequency synthesizer for providing a local oscillator signal;
- (d) a linear amplifier for amplifying the local oscillator signal output from said integrated frequency synthesizer;
- (e) a power divider for receiving a signal output from said linear amplifier and providing a first output signal and a second output signal;
- (f) a first isolator for coupling the first output signal to said mixer and for preventing reverse coupling of signals from said mixer to said power divider;
- (g) a variable attenuator, coupled to said power divider, for reducing a power level of the second output signal from said power divider;
- (h) a phase shifter for phase adjusting a signal output from said variable attenuator;
- (i) a second isolator for coupling an output from said phase shifter to a power combiner and for preventing reverse coupling of signals from said power combiner to said phase shifter;
- (j) a power combiner for receiving and combining a signal output from said mixer and a signal output from said second isolator;
- (k) a band-pass filter for receiving a signal output from said power combiner and for rejecting unwanted modulated components;
- and
- (l) a linear amplifier for amplifying a signal output from said band-pass filter.
Dependencies are inferred from the claim text.